Abstract
This article proposes a parameter estimation scheme for three-phase untransposed distribution lines. The estimation process is carried out using voltage magnitude (rms) and power-flow measurements from both ends of the line. The parameter estimation is carried out by considering the influence of measurement and instrument transformer uncertainties. A novel effective variance-based reweighted nonlinear least-squares scheme is proposed. Moreover, for estimation of untransposed line parameters under balanced loading conditions, the present work proposes a parameter estimation scheme using a reduced order model of the untransposed line. The accuracy and stability of the estimator are verified for the IEEE-13 bus test system. The algorithm is also tested with time-tagged remote terminal unit (RTU) measurements from a real distribution feeder.
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